Baxi Combi Boiler Error Codes



Power HT Plus Baxi Boiler List of Error Codes:

The E symbol continues to be displayed on the control panel. If the display of the error code persists, contact the accredited assistance service.

Error CodesSolutions
E10Outside sensor. Outside temperature sensor.
E20Boiler sensor 1. Flow back sensor.
E28Flue gas temp sensor. Flue gas sensor.
E40Return sensor 1. Return temperature sensor.
E46Return sensor cascade. Cascade return temperature sensor error.
E50HW sensor 1. Domestic hot water sensor (only for heating only models with domestic hot water tank).
E52HW sensor 2. Solar domestic hot water sensor (if incorporating a solar system).
E60Room sensor 1. Room temperature sensor 1 error.
E65Room sensor 2. Room temperature sensor 2 error.
E68Room sensor 3. Room temperature sensor 3 error.
E78Water pressure sensor. Hydraulic pressure sensor error.
E73Collector sensor 1. Solar collector sensor (if incorporating a solar system).
E83BSB short-circuit. Communication problem between boiler PCB and control unit. Probable short circuit on the heating.
E84BSB address collision. Address conflict between several control units (internal anomaly).
E91Data loss in EEPROM. Loss of data in EEPROM.
E98Extension module 1. Extension module 1 error.
E99Extension module 2. Extension module 2 error.
E1002 clock time masters. 2 master clocks.
E102Clock without backup. Master clock with no power reserve.
E103Communication failure. Communication error.
E109Boiler temp supervision. Air present in the boiler circuit (anomaly).
E110Lockout SLT. Safety thermostat cut-off for overheating (pump blocked or air in the heating circuit).
E111Shutdown limit thermost. Safety thermostat cut-off for overheating.
E117Water pressure too high. Pressure in hydraulic circuit too high.
E118Water pressure too low. Pressure in hydraulic circuit too low.
E125Boiler temp too high. Safety cut-off for absence of circulation (check made by a sensor).
E128Loss of flame in op. Flame extinguished.
E130Flue gas temp too high. Cut-off by flue gas sensor for overheating.
E133Safety time exceeded. Ignition error (4 attempts).
E151BMU internal. Internal error on heating PCB.
E152Parameterization. General parameter setting error.
E153Unit locked. Appliance locked manually.
E160Fan speed threshold. Fan operation error.
E162Air pressure switch. Flue gas pressure switch tripped.
E171Alarm contact 1 active. ACI board error.
E178Limit thermostat CH1. Safety thermostat CH1.
E179Limit thermostat CH2. Safety thermostat CH2.
E321HW outlet sensor. Domestic hot water sensor damaged.
E343Solar integration missing General parameter setting error on the solar system (if incorporating a solar system).
E353Casc sens B10 missing. B10 cascade sensor missing.
E372Limit thermostat CH3. Safety thermostat CH3.
E373Extension module 3. Extension module 3.
E384Extraneous ligth. Light incorrect (parasite flame - internal anomaly).
E385Mains undervoltage. Power supply voltage too low.
E386Fan speed tolerance. Fan threshold speed not reached.
E430Dyn water pres too low. Safety cut-off for absence of circulation (check made by a pressure sensor).
E432Function ground missing. Earthing function not connected.
E110Lockout SLT The code E110 is displayed when overheating occurs due to a breach in the insulation: Remove the heat exchanger. Replace the insulation behind the burner bracket. Replace the safety thermofuse behind the heat exchanger.
Baxi Boiler Control Panel Description

Baxi Boiler Control Panel Description

Automatic error code clearing: If the symbol ‘setting’ is displayed at the same time as the error code, the error code is automatically cleared when the cause that prompted it stops. A flow or return temperature in excess of the critical value prompts an error code. The error code is automatically cleared when the temperature drops below the critical value.




How to clear error code on baxi boiler?

If the probable cause of an error code is resolved but the error code continues to be displayed, proceed as follows to clear the error code:

  1. Press the ‘selection and confirmation button’ button. The command Reset? Yes is displayed on the control panel.
  2. Confirm by pressing the ‘selection and confirmation button’ button. The error code disappears after a few seconds.
Baxi Boiler Symbol Meanings

Baxi Boiler Symbol Meanings

Baxi Boiler Flashing Meanings

A lock-out condition can be re-set up to 5 times within one hour using the reset button. Any repeating fault should be fully investigated and appropriate remedial actions taken by your installer or Baxi Customer Support.

No. of Flashing FlashesGreen Light FlashingRed Light Flashing
1Temperature ProtectionSensor Error
2Shutdown InputHigh Temperature Protection
3Flame LossIgnition Fault
4Communication FaultFan Fault
5Parameter FaultParameter Fault
6MiscellaneousMiscellaneous

Baxi Combi Boiler Troubleshooting

TroubleSolution
There is no domestic hot water.The boiler is not switched on. Check that the boiler is switched on. Check the fuses and switches. Check that the gas valve is fully opened.
The DHW mode is deactivated. Activate the DHW mode using a suitable controller.
The water pressure is too low (< 0.8 bar). Top up the installation with water.
The energy-saving shower head is restricting the water flow. Clean the shower head; replace if necessary.
The DHW temperature setting is too low. Increase the temperature setting by using the rotary knob on the control panel or by using a suitable controller.
The radiators are cold.The heating temperature setting is too low. Increase the value of parameter p1 using a suitable controller or, if a room thermostat is connected increase the temperature.
The heating mode is deactivated. Activate the heating mode using a suitable controller.
The radiator valves are closed. Open the valves on all radiators connected to the heating system.
The boiler is not switched on. Check that the boiler is switched on. Check the fuses and switches. Check that the gas valve is fully opened.
The water pressure is too low (< 0.8 bar). Top up the installation with water.
The heating water temperature setting is too low. Increase the temperature setting by using the rotary knob on the control panel or by using a suitable controller.
The boiler is not working.The heating temperature setting is too low. Increase the value of parameter p1 using a suitable controller or, if a room thermostat is connected increase the temperature.
No power supply. Check that the boiler is switched on. Check the fuses and switches.
The water pressure is too low (< 0.8 bar). Top up the installation with water.
An error code appears on the display. Press the Reset button for 2 seconds. Correct the error if possible.
The gas pressure is too low. Check that the gas valve is fully opened. Open the gas valve.
The water pressure is too low (< 0.8 bar).Not enough water in the installation. Top up the installation with water.
Water leak. Contact the fitter.
Significant variations in domestic hot water temperature.Insufficient water supply. Open the valve.
Clicking in the central heating pipes.The central heating pipe connections are too tight. Contact the fitter.
There is air in the heating pipes. It is essential that you bleed any air in the calorifier, the conduits or the taps to prevent the annoying noises likely to be produced during heating or when tapping water.
The water is circulating too quickly in the central heating system. Contact the fitter.
Significant water leak under or close to the boiler.The boiler or central heating pipes are damaged. Close the water supply. Contact the fitter.

Baxi MainEco Combi Boiler User Manual PDF

Please, inform us about the error codes that you cannot find in the article.

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